Hello,
Sorry to say but we have further checked this, the Errors that are being generated under the Console related to these are related to wp-includes and a permalink-manager-pro plugin. Please refer to the following screenshots:
https://ibb.co/CnrbBst
https://ibb.co/1ZGLPsr
So, the wp-includes Errors are related to the WordPress end. So, we might suggest you contact the respective Plugin Support in this regard and tell them about these Errors. They might help you out with this.
Also, we are noticing that the PHP version on your Site is not updated to the standard version which is 7.4. So, kindly first try changing your PHP version to 7.4 too and then check back this concern again.
If the issue persists, then try contacting the Plugin Support because according to the Envato Policy we don’t provide Support for the third party Plugin issues. You will eventually need to contact the respective Plugin Support.
Best Regards